1002 Olbersia

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1002 Olbersia
1002Olbersia (Lightcurve Inversion).png
A lightcurve-based 3D-model of Olbersia
Discovery [1]
Discovered by V. Albitzkij
Discovery site Simeiz Obs.
Discovery date 15 August 1923
MPC designation (1002) Olbersia
Named after
Heinrich Olbers
(German astronomer)[2]
1923 OB · 1956 UR
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 81.87 yr (29,902 days)
Aphelion 3.2172 AU
Perihelion 2.3566 AU
2.7869 AU
Eccentricity 0.1544
4.65 yr (1,699 days)
0° 12m 42.48s / day
Inclination 10.767°
Physical characteristics
Dimensions 22.938±0.154 km[4]
24.31±0.36 km[5]
24.625±0.247 km[6]
32.13±2.3 km[7]
32.21 km (derived)[3]
10.2367±0.0005 h[8]
10.244±0.005 h[9]
0.0743 (derived)[3]
10.9[1][3][6][10] · 11.1[5][7]

1002 Olbersia, provisional designation 1923 OB, is an asteroid from the central regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 15 August 1923, by Russian astronomer Vladimir Albitsky at the Simeiz Observatory on the Crimean peninsula.[11] The asteroid was named after German astronomer Heinrich Olbers.[2]

Orbit and classification[edit]

Olbersia orbits the Sun in the central main-belt at a distance of 2.4–3.2 AU once every 4 years and 8 months (1,699 days). Its orbit has an eccentricity of 0.15 and an inclination of 11° with respect to the ecliptic.[1] The asteroid's observation arc begins at Uccle Observatory in 1935, twelve years after its official discovery observation at Simeiz.[11]

Physical characteristics[edit]

Olbersia is an assumed C-type asteroid.[3]

Rotation period and poles[edit]

In October 2007, a rotational lightcurve of Olbersia was obtained from photometric observations by French amateur astronomer Pierre Antonini. Lightcurve analysis gave a well-defined rotation period of 10.244 hours with a brightness variation of 0.38 magnitude (U=3).[9]

In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a concurring period 10.2367 hours, as well as two spin axis of (220.0°, 35.0°) and (16.0°, 54.0°) in ecliptic coordinates (λ, β) (Q=2).[8]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Olbersia measures between 22.938 and 32.13 kilometers in diameter and its surface has an albedo between 0.0621 and 0.147.[4][5][6][7]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0743 and a diameter of 32.21 kilometers based on an absolute magnitude of 10.9.[3]


This minor planet was named after Heinrich Olbers (1758–1840), a physician and amateur astronomer from Bremen in northern Germany. He discovered the main-belt asteroids 2 Pallas and 4 Vesta as well as six comets, and was the first to compute the orbit of comets with a certain degree of accuracy. Olbers' paradox is named after him, as is the lunar crater Olbers. The official naming citation was published by Paul Herget in The Names of the Minor Planets in 1955 (H 96).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1002 Olbersia (1923 OB)" (2016-12-21 last obs.). Jet Propulsion Laboratory. Retrieved 5 August 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1002) Olbersia. Springer Berlin Heidelberg. p. 87. ISBN 978-3-540-00238-3. Retrieved 5 August 2017. 
  3. ^ a b c d e f g "LCDB Data for (1002) Olbersia". Asteroid Lightcurve Database (LCDB). Retrieved 5 August 2017. 
  4. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 5 August 2017. 
  5. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 5 August 2017. 
  6. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 5 August 2017. 
  7. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 5 August 2017. 
  8. ^ a b Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114Freely accessible. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 5 August 2017. 
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1002) Olbersia". Geneva Observatory. Retrieved 5 August 2017. 
  10. ^ Faure, Gerard; Garrett, Lawrence (October 2009). "Suggested Revised H Values of Selected Asteroids: Report Number 4". The Minor Planet Bulletin. 36 (4): 140–143. Bibcode:2009MPBu...36..140F. ISSN 1052-8091. Retrieved 5 August 2017. 
  11. ^ a b "1002 Olbersia (1923 OB)". Minor Planet Center. Retrieved 5 August 2017. 

External links[edit]